diff --git a/.gitignore b/.gitignore
index 41e2fabd..c2d91ac2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,6 @@ target/
 # IntelliJ
 /.idea
 *.iml
+
+# https://github.com/liquibase/liquibase/issues/2196
+/derby.log
diff --git a/pom.xml b/pom.xml
index 66051ebc..2f7135ef 100644
--- a/pom.xml
+++ b/pom.xml
@@ -13,7 +13,7 @@
     <parent>
         <groupId>com.powsybl</groupId>
         <artifactId>powsybl-parent-ws</artifactId>
-        <version>17</version>
+        <version>18</version>
         <relativePath/>
     </parent>
 
diff --git a/src/main/resources/db/changelog/changesets/changelog_20230801T194601Z.xml b/src/main/resources/db/changelog/changesets/changelog_20230801T194601Z.xml
index ca6218f7..3447dc8a 100644
--- a/src/main/resources/db/changelog/changesets/changelog_20230801T194601Z.xml
+++ b/src/main/resources/db/changelog/changesets/changelog_20230801T194601Z.xml
@@ -3,7 +3,7 @@
     <changeSet author="hedhiliabd" id="1689623201842-1">
         <validCheckSum>8:e772a722c088f772d9dcc4be222f083b</validCheckSum>
         <modifyDataType columnName="element_type"
-                        newDataType="tinyint"
+                        newDataType="smallint"
                         tableName="contingency_entity_contingency_elements"/>
     </changeSet>
 </databaseChangeLog>
diff --git a/src/test/resources/application-default.yml b/src/test/resources/application-default.yml
index e5547bf7..828fb3dd 100644
--- a/src/test/resources/application-default.yml
+++ b/src/test/resources/application-default.yml
@@ -16,7 +16,7 @@ logging:
 powsybl-ws:
   database:
     vendor: h2:mem
-    query: ;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
+    query: ;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE;MODE=PostgreSQL;DEFAULT_NULL_ORDERING=HIGH
     hostPort: ":"